Western Union - Cross with at least 1"/3cm and bend at 90*. then bring both opposing ends back along the other to coil on its opposing wire and wrap 3 or 4 times(wiki has a good pic). So that's about as strong as any crimp will get anyway. And then you add solder and hopefully tape/latex/plastic.
But with old wiring with almost no slack I like to do my irresponsible connecting method:
- strip 3/4 in or 2cm from both ends
- put 1"/3cm of appropriate shrink wrap on the convenient end.
- spread both ends of wire into 90* wings.
- line the ends up level and try to make them layer before using your thumb and forefinger to turn them in on direction and make them look like one wire.
- Solder that junction completly, and let cool.
- With a wire in each hand, give it a decent pull to make sure you weren't being dumb.
- slide the shrink wrap over the connection, and heat it up.(a 700 watt heat gun is like 20$usd and worth it. same for soldering iron and multi-meter)
Good Luck.
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